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Some time ago I have been using a super useful hand programita NirSoft (Breathtaking their development), I guess you already know them tools like IPNetInfo (Offers useful information about the ip you want), PasswordSecurityScanner (That shows security information about local passwords used by tools such as Outlook, Internet Explorer, ...) and if you do not know, go to his web but ( "Do not be evil") that there is much potential.

With this tool we can sniff / capture traffic local wireless network or even in promiscuous mode, ie any packet which passes through the network before reaching a switch.

We can see the captured packets of talks between 2 or more computers, used their traffic, ports and local and remote addresses.

For example I've used to detect the bandwidth consumed by streaming connection to estimate in a consumption tested form the connection.

It could eventually be used to detect fraudulent traffic in a network by turning on promiscuous mode and using the driver winpcap to capture all packets because the tool even takes RAW socket able to capture TCP / IP packets without a capture driver.

After capturing a few seconds you will see everything what you can get to do. Where it goes traffic, hence, that deal size packages and ports used.